I have built 4 houses and placed 1-1/2" foam insulation under the basement floors and also around the exterior basement walls before backfilling.
On my pole barn, back in '77, The holes for the poles were drilled in rotten limestone. I concreted them in solid in the holes with a rebar alongside them, bent horizontal and stretched between each pole. Then formed and poured a stub wall between each pole, dug down as far as feasible onto the ground, Then poured the floor inside the wall with foam insulation under it. Has held up well and the floor in the heated portion stays pretty much the same temp year round.
Make sure you get the poles in the ground far enough into undisturbed earth if possible. I visited a fellow a few years ago to pick up a sandblast cabinet. His pole shed was only a couple years old and already, all 4 corners had heaved out of the ground about 6". It had been built on fresh fill to level the lot before construction.
Insulate the ceiling if at all possible during construction. I did not and have been kicking myself ever since.
Good luck and enjoy!!
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